High-temperature tilapia high-density culture

Tilapia is a warm-water fish native to the tropics and subtropics. During its vigorous growth from May to October each year, Tilapia can be used to promote tilapia as soon as possible during the high-temperature season. The main points to note are the following aspects: : I. Raising the water level and increasing the capacity of the aquaculture water After entering May, due to the continuous high temperature, the surface of the water body has a large amount of evaporation and the water level drops. In addition, the tilapia culture has a small specification at the early stage, and the pond load is not high, in order to increase the water temperature and the fatness. In general, the water level of the culture ponds is not high, and during the high temperature period, tilapia really enters the fast-growing period of Wangshi food and the pond load increases. Therefore, in this period of time, the water level of the culture should be increased to increase the capacity of the aquaculture water. In the high temperature season, the pond water level should be kept at 2-3 meters, and fresh water should be added at any time to reduce the water resistance and affect the growth of tilapia. Delayed time to market. Second, reduce the water quality, increase the amount of dissolved oxygen in the water Tilapia early breeding, fry is best able to feed natural food, which requires more water quality, and the use of fertilization and feeding combined farming methods, once into the hot season, then To reduce the use of fertilizers, especially high-density culture ponds, due to high water temperature and high fatness, dissolved oxygen in water will be reduced, resulting in deterioration of water quality. Therefore, it is necessary to control the amount of fertilizers during the high temperature period to keep the water quality fresh, and to control the transparency of water. In 20-25 centimeters or so, to ensure that pond water quality live, tender, cool, when the water quality is too fat, you can add new water, flush freshwater fertilizer, or use lime, "culture protection" to regulate water quality, increase water dissolved oxygen. Third, using physical and chemical measures, rational use of oxygen machine water temperature, increased oxygen consumption, high breeding density, resulting in reduced dissolved oxygen, in addition to the use of new water, adjust the water, but also the rational use of aerator, increase Dissolved oxygen in water, in the hot season, insist on starting the aerator for 1-2 hours in the sunny afternoon, stir the water body, so that the dissolved oxygen in the upper and lower layers of the water can reach saturation, and the time of nocturnal hypoxia floating head can be delayed. For high-density culture ponds, generally The aerator must be activated at night, especially in the case of rainy days or sudden changes in the weather. Fourth, to strengthen management, timely prevention and treatment of fish diseases in the hot season, because it is the season of tilapia growth, but also fish-prone season, in addition to stepping up the pond, carefully observe the water quality, growth, etc., but also pay attention to prevention and treatment of fish disease Occurrence, generally about 15-20 days, 15-20 kg of lime with water per acre per meter of water depth for the whole pond splash, adjust the water quality and kill bacteria, use chlorine dioxide once a month, the aquaculture water and food Disinfection, using a concentration of 0.25-0.3ppm, and regularly adding Chinese herbs to the feed to prevent fish diseases. V. Reasonable feeding The high temperature season is the season when tilapia grows vigorously. It is necessary to scientifically and reasonably adjust the amount of daily feeding and ensure that the food is eaten well. It is best to use the bait feeder for the high-yield, high-density breeding pond feeding. And feed pellets or puffed food, protein requirements in 28% -30%, fed twice a day, 9 o'clock in the morning or so, about 4-5 o'clock in the afternoon, each feeding time to be controlled at 40 - About 60 minutes, feed evenly so that most of the fish can eat feed. The feed amount is 3%-3.5% of the fish's body weight, and adjust according to their growth and feeding conditions to ensure tilapia Normal growth, improve the utilization of feed, in the hot season, due to the weather is changeable, we must pay more attention to weather changes, adjust the amount of feeding, such as low pressure, thunderstorm weather, it is necessary to reduce feeding or not feeding, so as not to waste feed, Pollution of water bodies affects the growth of tilapia. 6. Timely emergence of ponds to reduce the amount of ponds stored Because the growth of tilapia is limited by the temperature of the water, during the breeding period, especially during the high temperature period, some of the tilapia listed in the market specifications will be released to reduce the density of ponds. To enable small-sized fish species to grow as quickly as possible, meet the market specifications within a suitable long-water temperature period, and improve the overall aquaculture efficiency. During the high temperature period, tilapia should be selected for sunny weather, and be firstly stopped and flushed with fresh water. It is best to exercise by pulling a net and then go out of the pond to reduce the difficulty of transportation and transportation.

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